RE: TOFr HV

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From: Xu, Zhangbu (xzb_at_bnl.gov)
Date: Mon Apr 07 2003 - 17:50:38 EDT

Hi, Geary:
  If it is humidity, do we need to open the pole tip to do something
on 16/04 (more isolation on the cables?)? I am not sure what to
do, just curious and hope the experts know.
Thanks!
     Zhangbu

-----Original Message-----
From: Geary Eppley
To: Xu, Zhangbu
Cc: 'TOFp Operations '
Sent: 4/7/2003 5:13 PM
Subject: RE: TOFr HV

Hi Zhangbu,

We know that the fist output channel of the positive CAEN supply is
bad. The second output channel is fine. The first output channel seems
to
trip less with the lighter load of HVB, 9 modules, than with HVA, 19
module, load. There are some time periods of several days when the
first positive output doesn't trip and other periods when the first
output trips a lot. We have no real idea why some periods are worse than
others but I was speculating on humidity.

The fix on Wednesday will involve moving to the second and third outputs
of the CAEN. We haven't tested the third output but have no reason to
think it will be bad.

Geary

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